A Guide to the Identification of Seahorses Sara A
Total Page:16
File Type:pdf, Size:1020Kb
A Guide to the Identification of Seahorses Sara A. Lourie, Sarah J. Foster, Ernest W. T. Cooper, and Amanda C. J. Vincent A Guide to the Identification of Seahorses Sara A. Lourie, Sarah J. Foster, Ernest W. T. Cooper, and Amanda C. J. Vincent March 2004 Project Seahorse and TRAFFIC North America © 2004 University of British Columbia and World Wildlife Fund. All rights reserved. © Laurence Richardson for all drawings produced by Laurence Richardson. ISBN 0-89164-169-6 Reproduction and distribution for resale by any means Ñ photogr aphic or mechanical, including photocopying, recording, taping or information storage and retrieval systems Ñ of any parts of this book, illustrations or texts is prohibited without prior written consent from University of British Columbia (UBC), World Wildlife Fund (WWF), and Laurence Richardson. Reproduction for CITES enforcement or educational and other noncommercial purposes by CITES Authorities and the CITES Secretariat is authorized without prior written permission, provided the source is fully acknowledged. Any reproduction, in full or in part, of this publication must credit Project Seahorse and TRAFFIC North America. The views of the authors expressed in this publication do not necessarily reflect those of Project Seahorse, UBC, the TRAFFIC network, WWF, or IUCN-The World Conservation Union. This publication was prepared in part under award number NA03NMF4630332 from the National Oceanic and Atmospheric Administration, US Department of Commerce. The statements, findings, conclusions, and recommendations are those of the authors and do not necessarily reflect the views of the National Oceanic and Atmospheric Administration or the Department of Commerce. The designation of geographical entities in this publication and the presentation of the material do not imply the expression of any opinion whatsoever on the part of Project Seahorse, TRAFFIC, or their supporting organizations concerning the legal status of any country, territory, or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries. The TRAFFIC symbol copyright and Registered Trademark ownership are held by WWF. TRAFFIC is a joint program of WWF and IUCN. Suggested citation: Lourie, S. A. et al. 2004. A Guide to the Identification of Seahorses. Project Seahorse and TRAFFIC North America. Washington D.C.: University of British Columbia and World Wildlife Fund. Cover photo of Hippocampus ingens by Wolcott Henry. Back cover photo of dried seahorses for sale as traditional Chinese medicine. Right tray holds bleached H. barbouri. Left tray holds a mix of H. comes, H. spinosissimus, H. trimaculatus and H. ingens. Photo by Ernest W. T. Cooper, TRAFFIC North America. Order Gasterosteiformes / Family Syngnathidae CITES Appendix II TABLE OF CONTENTS ACKNOWLEDGEMENTS ii 1.0 INTRODUCTION 1 2.0 METHODS 1 3.0 SEAHORSE CONSERVATION AND BIOLOGY 3 3.1 Conservation 3 3.2 Biology 5 4.0 SEAHORSE MORPHOLOGY AND IDENTIFICATION 7 4.1 Morphology 7 4.2 Identification 7 5.0 SPECIES DESCRIPTIONS 20 REFERENCES 88 APPENDIX A. SEAHORSE IDENTIFICATION DATA SHEET 94 APPENDIX B. HOW TO USE THE SPECIES CHECKLIST 95 APPENDIX C. PHOTOGRAPHIC ATLAS OF DRIED SEAHORSES 97 APPENDIX D. TAXONOMY OF H. histrix AND H. kuda 103 APPENDIX E. DISTRIBUTION OF SEAHORSE SPECIES BY COUNTRY 104 APPENDIX F. COLOUR PLATES OF SEAHORSE SPECIES 109 LIST OF FIGURES 1 External Morphology of a Seahorse 9 2 Rings Supporting the Dorsal Fin 11 3 Example of a Dried Seahorse Specimen with Morphological Data 95 LIST OF TABLES 1 Maximum Heights Recorded for Species of Hippocampus 13 2 Ratio of Head Length to Snout Length (HL/SnL) for species of Hippocampus 14 3 Number of Tail Rings per Species of Hippocampus 15 4 Number of Dorsal Fin Rays per Species of Hippocampus 17 5 Number of Pectoral Fin Rays per Species of Hippocampus 18 6 Numbers of Trunk Rings, Rings Supporting the Dorsal Fin, Cheek Spines and Eye Spines per Species of Hippocampus 19 7 Completed Species Checklist for Seahorse Specimen Illustrated in Figure 3 96 i Order Gasterosteiformes / Family Syngnathidae CITES Appendix II ACKNOWLEDGEMENTS Many people made important contributions to this guide. James Hrynyshyn of Project Seahorse revised the maps in the guide and provided invaluable assistance in the preparation of the graphical elements for review drafts. Adriana Suarez Blanch, Maylynn Engler and Andrew Short assisted by reviewing and testing the identification methodology in Section 4.0. Rhema Bjorkland, Sheila Einsweiler, Boris Kwan, Richard Labossiere, Samuel Lee, Stephen Nash, Steven Price, Adrianne Sinclair and Chris Woods all provided insight and helpful comments on draft texts of the guide. Kimberly Davis, Craig Hoover and Tina Leonard of TRAFFIC North America contributed greatly to the development and oversight of the project. Section 5.0 of this guide could not have been completed without the information produced by the many researchers referenced therein. The colour illustrations and all of the line drawings used in Section 5.0 – except for H. denise – are the work of Laurence Richardson. The line drawings of H. denise were provided by Sara A. Lourie. The line drawings used in Section 4.0 and the photographs in Appendix C were prepared by Ernest W. T. Cooper. We are particularly appreciative of the support and encouragement provided by the CITES Secretariat, the U.S. Fish and Wildlife Service and the U.S. National Oceanic and Atmospheric Administration (NOAA) Fisheries during the development and completion of this guide. This project was made possible thanks to generous funding support from the Donner Canadian Foundation, the Curtis and Edith Munson Foundation and the NOAA Coral Reef Conservation Grant Program. It draws on research undertaken with generous support from Project Seahorse partners, the John G. Shedd Aquarium (USA) and Guylian Chocolates (Belgium), as well as a William Dawson Scholarship (to Amanda Vincent). The first identification guide for seahorses, on which this manual is based, was supported by the Rufford Foundation, Maurice Laing Foundation, United Kingdom Natural Environment Research Council, Royal Society and British Airways Communities and Conservation. ii Order Gasterosteiformes / Family Syngnathidae CITES Appendix II 1.0 INTRODUCTION The 12th meeting of the Conference of Parties to the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) took place in Santiago, Chile, from November 3 to November 15, 2002. During this meeting the Parties (signatories to CITES) voted to include all seahorses (genus Hippocampus) in Appendix II of the Convention, effective May 15, 20041. Effective implementation of the CITES listing will require that government authorities and other stakeholders be able to identify seahorse species that are utilized in international trade. This guide has been developed to help meet this need. The goal of the guide is to provide technically accurate information that is useful to specialists and non-specialists alike. This is no simple task as many species are similar in appearance and their identification can be challenging. The trade in seahorses involves both live and dead specimens. In some regions the live trade is the dominant pressure on seahorse populations, but the great majority of the seahorses in international trade are dried and destined for use in traditional medicine (see Section 3.0). This guide therefore has been designed with a bias towards the identification of dead specimens. 2.0 METHODS The species descriptions provided here are based on a 1999 publication by Lourie et al entitled Seahorses: An Identification Guide to the World’s Species and their Conservation 2. Materials from this earlier publication have been revised and reformatted and new content has been added to produce this guide.Lourie et al2 describe 32 species of Hippocampus. Recent work, notably by Horne3 and Kuiter4, 5, 6, has led to the description of other seahorse species. Further morphometric and genetic research is likely to prove at least some of these species designations valid, and there is every indication that seahorse taxonomy will continue to evolve and that new species will be described. The practicalities of management and enforcement of the CITES listing, however, necessitate that the seahorse taxonomy be held to a clearly defined list. The taxonomy used in this guide is therefore based on the 1999 Project Seahorse listing, with the addition of H. denise. This guide is limited to these 33 species. The original maps in Lourie et al showed only confirmed location data2. These maps have been modified to show the approximate ranges for each species based on both the confirmed and suspected distribution. The countries of occurrence in the species descriptions have similarly been separated according to whether the occurrence is confirmed or suspected. Twenty-five of the line drawings of seahorse species used in Lourie et al2, have been reprinted in this publication. The original drawings of H. angustus and H. erectus have been replaced and those of H. abdominalis, H. barbouri, H. comes and H. zebra have been revised; new drawings of a male H. camelopardalis and a female H. zebra have been added. Colour illustrations of the 33 species have been added. All drawings and revisions were made from preserved specimens or from photographs supplied by Project Seahorse. 1 Order Gasterosteiformes / Family Syngnathidae CITES Appendix II Section 4.0 and Appendices A and B were developed from the information provided by Lourie et al2 and Lourie and Randall, 20038, and through examination of dried specimens. Tables 2–5 show the range of values for each characteristic. The values highlighted in black represent the modal (most common) values for counts such as the number of tail rings, and the average value for measurements such as the ratio of head length to snout length (HL/SnL). The biological information included in Section 5.0 has been updated from Lourie et al2, based on an extensive literature search and on contributions from members of the networks of syngnathid researchers and aquarium professionals, co-ordinated by Project Seahorse.